Leaf of vacuum-filters for cyanid process.



Y. OHI'SUKA.

LEAF 0F VACUUM FILTERS POB. CYANID PROCESS. APPLIOATION FILED HBA, 1914.

1,1 1 1,609. Patented sept. 22,1914.

wnmess "WEA/voir l wa/em I Y l( ATTOI? N E YS 'r'I-'I-` NoRRlS PETERSC0., PHOTO-LITRO., WASHINGTDN. D. CA

1,111,609. v t I i i A'ppiitafimrlaia rebriiaryiieia Mseriai'ivaeieaajl- LEFf-Qj vacuna-rimane .ron cri-infn Paocnss.

vstroi'lger th Be it known that I', YiiiiioiirOiirsUK-A, a

` subject of the `Emperor lof Japanfaiidaresi- *dent of Tokyo, Tapan,haveinvented a new t and "useful Improvement in Leaves of Y Yaciiiim-Filters {for `"vlirocess,"i` of 'whichjthe following is a ffull,clear",)andv exactV descriptioiij4 V This invention relates pressed ontheycore by the barsl-LLBy con-v piiiiip, the' liquid isfsuckedlout'from suction pip`e, so fthe 4suckingfaction `is graduallyfincrease'shy. the capillary-faction upper and lower yparts of thefle'af, and thethickness ofl mud4 deposited on tliezl leaf is not uniform..In-the`working, higlivacuum fori "suctionalways isk required, for. `theflower 4part yis quickly covered'by` the thicky mud;A

suction holes or perforations l7 are provided only in the upper side; ofthe bottom partof by which` the resistance ,for filtration of liquid isincreased, and the resistance for filtration inthe `upper part `is'stillgreater, which is the greatdefect of the `ordinary leaf of this kind.'t. y t The object of this invention is to improve this ldefect by thenew construction` ofthe core above stated, in which the vertical ceniter rods pass through from the bottoni suc- `tion pipe to the head beamin the'center of the leafto form spaces along the rodsforf the passageof the liquid, so that the suckingaction ofthe bottom suction pipey is`dis` ftributed at onceuniformly `throughout `the -also `may be greatlysaved.y

whole surface of the leaf, and the "defective resistance forrfiltrationof liquidis greatly decreased, by which the'power ofthe pump tthe'const-riiction' of" leaves 'of- `vacuum f filters* which' "are used1 thei `separation of a: solution-of y.precious Inietals 4from its`slime,"fin` cyanid process. n A2 Ursh apedl suction pipe :is attachedvto the horizontalheadbeam ofjtheI leaf, aicore,

which4 consists fof vertical center` .rods and v horizontal woven stripsisarrangedbetween vthem. 'l`he"'filter cloth,f`whi`ch `cdvers 'the'both` sides lof ,the core and suction' pipe outwardly, is" attached tol.the*headbeam, and' y `.necting the suction p'ipetofthe ,:fvacuunilower t part *of the leafiaiid "4 its. action decreasesgraduallytowardtgthe, upper part, for the resistance `for filtration Invvthe accompanying drawings;Figure d sepaee, ,1914i is a yse'cti'oii'altelevationl'of theiilter tank v'" `with the =leaves arranved Ain" theirois p sition;` Fig.; 2f is an elevation o fa.` leaf laccording tothisinvention, Vin',whicha 'part is shown broken away to vshow the internalconstruction;` Fig; Sis a sectional side elea vatio'nof"theleaftakenfthrdugh-the line tionalfviewltakenthrough the linefC-D ofFgf; Fig.` 5 isaii 4enlarged sectional view taken throughtheline in'Fig;2;"Fig. l

6 is a fragmentary horizontal sectional view ofthe ,le'afgfand Fig. 7 isa fragi'nentaryv horizontalv sectional w'view.. pfy "the leafinA"modified" form. 3

ia Fig; 1,1- me uit' naves suspended joli "1' tank edge. A' conduit 6;which is Vconnected 'to theslinie reservoir by any-proper method,

in the bottom of "the tank, conducts the slim efroin the reservoir :to'the' tank, and the 4Thenumeral 3 represents the bottoni'` doors,

.which niaygbeopened4 downward by the hinges 9' toy flowffeutlt'he-mud,but they "are "5' usually kept invwater, tight engagement with thesidesV orclosedby means of the 1 rscrew -bolts S'orAveigl-VitslO,"andthe whole apparatus is supportedfby the beamsfa aind`pilrangementsand constructions, howeverymay be conveniently designed and constructed.

In Figsto 6, inclusivd'is shownthe'construction of a Vlea'faccording tothis invention. AcUg-shapedsuctionpipe l'is` attached toahorizontalheadbeamll of the leaf, and

suction pipe. i One end of the suction pipe is yclosed, and'pother end,which projects out above.'tlie head` beam, is connected to a vacuunipumpby any suitable method, so that the iltratedliquidshall be sucked outthrough the suction holes 17 ,in the operaioc ably are made `from bamboosticks, are fasf -t'ened `verticallybetweeii the headfbeam 11 t andthefbottom partv of suction pipe 16, these -rods being properly spacedapart or dis-` tanced from eachother.l kThe two sheets 19a," 19h ofhorizontal strips, which preferably are A state' also made from bambooand Woven together by the strings 23, are Xed on both sides of core oftheleaf. As the' ilter'clth 20, Which covers the core and the suctionpipe outvvl/afrdly, anvas .'o'r other coarse Woven materials shall beused in nsingle or double, and it is pressed .on the coreby the bars 2land bolts 22,'` connectingv the same. K The up-l per"` I'na'gin of thecloth is attached to the sides... 1 y vv'hich thekinargin is lgrasped bybars 14',- seat'd iIi the gro'ovesjand-bolts 15, engaged ,hrtli'gunantais and beam, as Shown in *i0:.,4:,

, ig'.; fsliivs *thev modification of the core, iiil Whichthe horizontalstrips are Woven in alternately ibetv'veen the verticalucenter rods,insteadof being Woven together kto form' v a sheet by s rings, as in theprevio'us descrip-A tcording" to the-H construction .above theverticalcenter rods 1S Iform the spaces 24 for the passage of liquidbetyveen.themglin the center. yof the core, as shown in 4 v6,. the spaces passthrough from the bp'ttoin suctionplpe to the head'beani.' In ti `emodification, shown in Fig. 7, t'hespaccs `24 are lalsoiormed in thecenter ofthe leaf by the vertical center rods. lVhen thevacuujn1pu1np isAput into operation and the suction pipe I6 begins to absorbthe'iltratedliquid, ther .sucking action. shall be spread over fromjthe bottom tothe-top throughA the spaces l 24, and uniformly distributed throughoutthe ,Whole surface of the leaf, so

tha-@the niud shall be uniformly deposited I on the', leaf, and theresistance for filtration is u'niforrn in lall parts of the leaf.- Onthis account; the Working alwaysfcan be opera-ted in low vacuum, thusexceedingly saving the Workingpower of the-plump.

In the practical Working of this invention, y

,head by the gr'odvef13,` in

l the vertical icenter'rods vand horizontal strips @if the corejshalldbe .madey from bamboov the vertical center rods, and these formthe S-,fiaafowhe reason that www@ light in Weight, easily l'e'Xiblf anddurable' in use, i but the other'ma-terials such as proper hard Y j usedfor. the purpose. i l y v,

vHaving thus Afully described 4my invention, what I claim,

ters VPatent of. .the .United States, is#- l, A lealjffof vacuum filtershavingv a corefy consisting' verticalcenter reds of bamboovandhorizoifltal strips ysovdisposed.as to orm .4

clear verticalk spaces forspassage of iiltrated liquid in'jthe'centerofthe leaf, substantially scribed-f a l i as and for ther ypu'rpseIhereinbefore de,-V

tached to saidA supportingI part, and Ia core,

rods andA ho'rizorita stripsl'on ehxside thereof gforiiaiiig'peftrlatmats; 'aad-prode@- 1 said core conipijisino spaced verticalceiiter iing' vertical( spaces ivith'the iids for'tlie the. @esta of and meanscarried'by the ksuppoltin'z'gi .part

outwardly @if the. clears cloths fthe strips and connectingfsaid artssaid suct'bn",i'aehavinimr eifforate `sides aiidsperftuiesiii the upper'sidepf its '75 battelli ,A por-tion omrimmicatiag sith? the ,i

deposit.througheutthe 'area ofthefcor'e' .is jrendereduniform. i j p i AI n,-.testimony4 whereof I have signed"my nanl of tive subscribin'Witnesses. b y

' e iiKIcHi o'HTsUKA.

y. l RiNKIoHi I-IETAKE'NAKA.

to this speciki'ieation the presente v Vacuum filters oompr/i'singasupporting` part, aiu-shaped su'lotionpipe at-

